| 摘要 |
PURPOSE:To aimt at increasing the quantity of cooling water for a heater, by installing a radiator bypass passage and a heater side cooling passage in parallel, while installing a regulator, which throttles the bypass passage when cooling water pressure is low, in the said bypass passage. CONSTITUTION:Cooling water run past a radiator 3 is sucked in a suction side 4a of a water pump 4 and, after it circulates a water jacket, reaches to a thermostat 2. In time of low temperature in the cooling water, the thremostat 2 is closed whereby the cooling water is designed so as to go back again to the suction side 4a of the water pump 4 via a bypass passage 5. In parallel with this bypass passage 5, there is provided with a heater side cooling water passage 6 having a heater 13. And, at the middle part of the bypass pasage 5, a regulator 8 which throttles a flow area of the bypass passage 5 when cooling water pressure out of the water pump 4 is low is installed, so that the quantity of cooling water for the heater side cooling water passage 6 is made so as to be secured in design. |
